GIMP-GAP no video encoder

I use Suse 11.2 64 bit with GIMP 2.6.7-4.4 x86_64 and GIMP-GAP 2.6.0-4.1 x86_64. Additionally I have ffmpeg, libmpeg3 and all other needed encoder (?) installed from non oss repos.
But when I try to use the Master Video-encoder from GAP there is no encoder available.
Has anyone an idea what is missing?
Any help is appreciated.